Shinrei Jusatsushi Taromaru

Psychic Killer Taroumaru is a sidescrolling 2.5D action game featuring sprites for the main characters and polygons for the backgrounds, similar to Klonoa. You can play as one of two characters - the ninja Taroumaru and his buddy Enkai, who wears a huge straw hat and looks very similar to Sokazku Mochizuki from Fatal Fury. Other than some minor discrepancies with attack ranges, they're mostly indentical. The setting is vaguely similar to Sega's old Mystic Defender/Kujaoh series, in that you're fighting mythical bad guys in a medieval Japanese setting. It also tends to draw comparisons to classic Konami and Treasure games, mostly due to its level structure, featuring tightly designed set pieces and a ton of amazing boss encounters. The only real relation to Treasure is that one of the graphical designers was Hiroshi Iuchi, who worked on visuals in earlier titles like Gunstar Heroes, then later returned to Treasure to direct Radiant Silvergun and Ikaruga.